ISL6535IBZ

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ISL6535IBZ application field and working principle

The ISL6535IBZ is the latest product in Power Integrations Inc.\'s DC-DC Switching Controllers portfolio. It is a highly efficient, inexpensive synchronous step-down controller designed to deliver power from input voltages up to 7.5V to an output voltage of 0.6V to 7.5V. It features high current mode and is suitable for use in applications such as automotive, industrial, telecom and consumer applications.

Application field

The ISL6535IBZ can be used in a wide range of applications, including:

• High-end gaming consoles
• Data storage systems
• Telecommunications
• Network routers
• OLED lighting
• Automotive modules
• Consumer electronics

Working Principle

The ISL6535IBZ is a digitally-programmable four-terminal synchronous step-down DC-DC controller organized into 4 main blocks – a Skip Cycle Mode Controller, Peak Current Mode Control, Soft Star/Stop, and Digital Power Ratio Control. The Skip Cycle Mode Controller is designed to reduce the average input current by bypassing switching cycles based on the differential voltage between the input voltage and the output voltage. This reduces the switching losses and helps maintain peak efficiency under light-load conditions.

The peak current mode control is used to vary the output current as required in order to keep the output voltage stable. A pulse-by-pulse current limit feature is built in to prevent over-current situations and protect the output components from damage. The Soft Start/Stop is used to ensure a smooth transition when starting, stopping or restarting the system, and it also helps reduce the in-rush current at start up.

The fourth and final block is the digital power ratio control, which is used to adjust the duty cycle of the Pulse-Width Modulated (PWM) signals. This allows precise adjustment of the output voltage as per the requirements of the application. The ISL6535IBZ includes built-in protection circuitry, such as under-voltage lockout, over-voltage protection, over-temperature protection and current foldback protection.

Conclusion

The ISL6535IBZ is a versatile, efficient and cost-effective synchronous step-down DC-DC converter controller suitable for use in a wide range of applications. It features Skip Cycle Mode Controller, peak current mode control, soft start/stop, as well as a digital power ratio control which allows precise adjustment of the output voltage. It also has built-in protection circuitry for safety and reliability in operation. This makes the ISL6535IBZ a popular choice for designers looking to build high-performance, power-efficient solutions.

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